chipmunkbot3/commands/echo.js

const { literal, argument, greedyString } = require('brigadier-commands')

module.exports = {
  register (dispatcher) {
    const node = dispatcher.register(
      literal('echo')
        .then(
          argument('message', greedyString())
            .executes(c => this.echoCommand(c))
        )
    )

    node.description = 'Sends a message in chat as the bot'
    node.permissionLevel = 0
  },

  echoCommand (context) {
    const bot = context.source.bot
    bot.chat.queue.push(this.sanitize(context.getArgument('message')))
  },

  sanitize (message) {
    let clean = ''

    for (let i = 0; i < message.length && clean.length < 256; i++) {
      const c = message[i]
      const cc = c.charCodeAt(0)

      if (cc < 0x20 || cc === 0x7f || cc === 0xa7) continue
      clean += c
    }

    return clean
  }
}